Just received 5x long life 100W CO2 laser tube 'F4'. The tubes are made in Beijing. The manufacturer claimed that it last for up to 6000hrs. The price is very competitive and affordable. Also, two new tubes member and it's SP60W and SP80W laser tube. It's made in Shanghai and quality is highly recommended by a number of laser manufactures in South China. Both anode and cathode is gold plated and a small ground wire attached to the water intake.